Register Ridge

The San Gabriel Mountains are a mountain range located in northern Los Angeles County and western San Bernardino County, California, United States. The mountain range is part of the Transverse Ranges and lies between the Los Angeles Basin and the Mojave Desert, with Interstate 5 to the west and Interstate 15 to the east.

Mount San Antonio, colloquially referred to as Mount Baldy, is the highest peak of the San Gabriel Mountains, and the highest point in Los Angeles County, California. The peak is within the San Gabriel Mountains National Monument and Angeles National Forest. It is the tallest mountain in the Los Angeles metropolitan area.

Baldy Bowl is a fluvial cirque, in the San Gabriel Mountains of the U.S. state of California, that forms much of the upper south face of Mount San Antonio. It is one of the most visited backcountry locales in the San Gabriels, and is popular with skiers, hikers, and climbers. It has a base elevation of around 8,200 feet (2,500 m).

Mount Harwood is the first summit east of Mount San Antonio. The United States Geological Survey recognized the name to honor California educator and conservationist Aurelia Squire Harwood in 1965. Prior to this, the peak now known as Thunder Mountain was also referred to as Mount Harwood. Mount Harwood is located on the East side of the San Gabriel Mountains in the Angeles National Forest near the San Bernardino-Los Angeles county border.